<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
    .container{
        width: 230px;
        height: 93px;
        background: #655;
        padding: 10px;
    }
    .container div{
        background: tan;
        border-radius: 10px;
        padding: 15px;
        color: #ffffff;
    }
    </style>
</head>
<body>
   <div class="container">
       <div class="box">
        I have a nice subtle inner rounding,don't I look pretty?
       </div>
   </div> 
</body>
</html>